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Let s check out the EXPLAIN to see if what we expected to happen actually did Listing 8-52 shows the results Listing 8-52 EXPLAIN Output from Listing 8-51 mysql> -> -> -> -> -> -> -> -> -> EXPLAIN SELECT LEFT(address, 30) as address , city , state , zip FROM ZCTA x1, ZCTA x2 INNER JOIN StoreLocation sl ON x2zcta = slzip WHERE x1zcta = '21236'.

public class DirectorySelectedEventArgs : EventArgs { private string directoryName; public string DirectoryName { get { return directoryName; } set { directoryName = value; } } public DirectorySelectedEventArgs(string directoryName) { DirectoryName = directoryName; } } Here s the DirectoryTree code that fires the DirectorySelected event: public delegate void DirectorySelectedEventHandler( object sender, DirectorySelectedEventArgs e); public event DirectorySelectedEventHandler DirectorySelected; protected override void OnAfterSelect(TreeViewEventArgs e) { base.OnAfterSelect(e); // Raise the DirectorySelected event. if (DirectorySelected != null) { DirectorySelected(this, new DirectorySelectedEventArgs(e.Node.FullPath)); } } You can respond to the DirectorySelected event and perform additional work with the directory, like showing the files it contains in another control.

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Just as you derive controls from existing control classes, you can also derive a new form from an existing form class. Of course, every form derives from the System.Windows.Forms.Form class, but you can add extra layers of inheritance to standardize form design. For example, you can create a custom form named MyFormTemplate (which derives from the Form class), and then derive additional forms from MyFormTemplate. This technique is called visual inheritance, although conceptually it isn t different from inheritance in any other scenario. Visual inheritance has acquired a mixed reputation based on some of the idiosyncrasies it had in .NET 1.0. Problems included the following:

-> AND ACOS(SIN(x1.lat_radians) * SIN(x2.lat_radians) -> + COS(x1.lat_radians) * COS(x2.lat_radians) -> * COS(x2.long_radians - x1.long_radians)) * 3956 <= 5 \G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: x1 type: const possible_keys: PRIMARY key: PRIMARY key_len: 6 ref: const rows: 1 Extra: *************************** 2. row *************************** id: 1 select_type: SIMPLE table: sl type: ALL possible_keys: zip key: NULL key_len: NULL ref: NULL rows: 9640 Extra: *************************** 3. row *************************** id: 1 select_type: SIMPLE table: x2 type: eq_ref possible_keys: PRIMARY key: PRIMARY key_len: 6 ref: jobs.sl.zip rows: 1 Extra: Using where 3 rows in set (0.00 sec) Did it work Well, almost. This time, MySQL at least gave itself the option of using the index on StoreLocation.zip, but in the end, decided it was faster to simply use a table scan of the StoreLocation data.

the ASP.NET application to store and retrieve personalization data to and from the Oracle database. Oracle Cache Dependency This provider automatically invalidates cache data created by the ASP.NET application when there are changes in the underlying Oracle database. This provider helps improve ASP.NET application performance by keeping database data in the cache as long as possible and performing a fetch only when the data has been invalidated.

Quirky design-time support, which sometimes necessitated closing and reopening a project to get past a cryptic error or see a change in the designer. Problems with anchored controls not being properly resized or relocated. This problem stemmed from the use of the SuspendLayout() and ResumeLayout() methods in the designer-generated code. Problems with control serialization, such as adding redundant lines in the designergenerated code for the derived form. The good news is that these problems are ironed out in .NET 2.0, and Visual Studio now includes solid design-time support for visual inheritance. Depending on how you use visual inheritance, you can accomplish two things: Use a common form template (appearance) for several different windows. This might be useful to create a wizard or standardized About window. Use form functionality in several different windows. This allows you to create a framework that you might use for different types of view windows in a Multiple Document Interface (MDI) application. Every window will have its own look, but it might reuse some of the same buttons to close the window or open a file. As with any type of inheritance, visual inheritance gives you many different ways to customize how the descendent class can use, extend, or override the inherited class.

Take the time to consider if there is a better or faster way of doing things. Rewrite your SQL queries Tip

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